For Android and iOS devices Duo works on Android and iOS smartphones and tablets, so you can call all your close friends and family using just one app.

Knock Knock See who’s calling before you pick up with a live video preview.

Video Messages Friend can’t answer your call? No problem. Leave them a video message for them to call you right back. With a video message, you can still capture everything about that moment you wanted to share.

Voice Calls Make voice-only calls to your friends when you can’t chat over video.

*Based on Signals Research Group technical study comparing video degradation time over 3G, LTE, and WiFi.